The PHP Foundation says first signs of the flaw behind CVE-2026-109618 appeared in 2024, and the fix then stalled for months: "a structural failure." PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35 fix it and CVE-2026-109619, both unauthenticated RCE (CVSS 9.2). It says Chainguard broke the embargo 6+ hours early; Chainguard's CEO told The Register he shipped because vendors reported exploitation. AWS saw a honeypot attempt on Oct 17.
thephp.foundationToday's PHP Security Release, and How We're Strengthening PHP SecurityDescribing the story behind how critical security vulnerabilities were found and fixed.